On the left side of the tractor below the valve for the PTO there is a plug to take out to put a gage in. Then you turn the stem to the valve in or out to adjust the pressure on the clutch. It should be around 150-230 Psi I think. One at one engine speed and the other at PTO speed on your tach.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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